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Old 16-04-2020, 12:31 PM
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AstroJunk (Jonathan)
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AstroJunk is offline
 
Join Date: Jan 2006
Location: Moonee Beach
Posts: 1,909
I had to do this myself a couple of weeks ago whilst building an observatory.

Here's a photo of my approach. I used a camera tripod with a makeshift plumb bob to ensure it was dead center of where the pier is destined to go, I ballanced a tube wrench on top to make it a little more 'pointy' and waited for solar noon (11:52 on that day).

Mark the position, draw a line, simple as that.

A week later I installed the scope and aligned it to the chalk mark on the floor. When I went to do a polar alignment at night I found that I was already within 20 arc second of true
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